There isn't a single, direct Greek phrase for "wandering star." However, we can break down the concept into its components and find suitable Greek equivalents:

* Wandering: This could be translated as πλανήτης (planētēs), which literally means "wanderer" and was the original term used by ancient Greeks to describe what we now call planets.

* Star: This is straightforwardly αστέρι (asteri).

Therefore, depending on the context, you could express "wandering star" in Greek as:

* πλανήτης αστέρι (planētēs asteri) - This literally translates to "wandering star," emphasizing the movement.

* πλανήτης (planētēs) alone can also be used, as it originally referred to celestial bodies that moved differently from fixed stars.

It's important to remember that the ancient Greeks didn't always conceptualize planets as we do today. They saw them as distinct from "fixed stars," but not necessarily as "wandering." So the translation might depend on the specific context and what you want to emphasize.